Two Series of Lanthanide Metal-Organic Frameworks Constructed from Crown-Ether-Like Secondary Building Units

• Published in: European journal of inorganic chemistry 2014-03, Vol.2014 (7), p.1185-1191
• Main Authors: Wang, Hao, Wen, Rong-Mei, Hu, Tong-Liang
• Format: Article
• Language: English
• Subjects: Buildings; Construction; Crown compounds; Formations; IR spectroscopy; Lanthanides; Luminescence; Metal-organic frameworks; Networks; Nitrates; Secondary buildig units; Three dimensional
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201301324

Two series of lanthanide metal‐organic frameworks, [KLn3(FDCA)5(H2O)5]·solvent (1Ln) (Ln = La 1, Ce 2, Pr 3), [K4Ln8(FDCA)14(H2O)30]·2(H2FDCA)·DMAC·10(H2O) (2Ln) (Ln = Eu 4, Gd 5, Tb 6, Dy 7, Er 8, DMAC = N,N‐dimethylacetamide), have been prepared by solvothermal reactions of 2,5‐furandicarboxylic acid (H2FDCA) and KNO3 with the corresponding lanthanide nitrate. X‐ray crystal structure analyses show that 1Ln possesses a 3D network based on the “16‐crown‐6‐like” secondary building unit (SBU), whereas 2Ln exhibits a 1D framework with a “23‐crown‐9‐like” SBU. The structural investigation unambiguously demonstrated that the lanthanide contraction affects the formation of 1Ln and 2Ln. Meanwhile, the solid‐state photoluminescent properties of 4 and 6 were also investigated at room temperature and the luminescence intensity of 4 is sensitive to small molecules. Lanthanide MOFs have been synthesized by using solvothermal reactions between 2,5‐furandicarboxylic acid and KNO3 with the corresponding lanthanide nitrate. 1Ln (1–3) possesses a 3D network based on the “16‐crown‐6‐like” secondary buildig unit (SBU), whereas 2Ln (4–8) exhibits a 1D framework with a “23‐crown‐9‐like” SBU. Structural investigation unambiguously demonstrated that the lanthanide contraction affects the formation of 1Ln and 2Ln. Moreover, the luminescence intensity of 4 is sensitive to small molecules.